Yahoo Mail, sometimes shortened as Ymail, is an e-mail service launched in 1997 through the American parent company Yahoo. Yahoo Mail provides four different email plans: three for personal use (Basic, Plus, and Ad Free) and another for businesses.[5][6] By December 2011, Yahoo! Mail had 281 million users, making it the third largest web-based email service in the world.[7] Since 2015 its webmail client also supports managing non-Yahoo e-mail accounts.[8]

As many as three web interfaces were available at any given time. The traditional "Yahoo! Mail Classic" preserved the availability of their original 1997 interface until July 2013 in North America. A 2005 version included a new Ajax interface, drag-and-drop, improved search, keyboard shortcuts, address auto-completion, and tabs. However, other features were removed, such as column widths and one click delete-move-to-next. In October 2010, Yahoo! released a beta version of Yahoo! Mail,[9] which included improvements to performance, search, and Facebook integration.[10] In May 2011, this became the default interface.[11] Their current Webmail interface was introduced in 2017.

Yahoo! Business Email is a combination of all of their email services. The service includes 10 distinct accounts, each with the same features of Yahoo! Plus, as well as a personalized domain name and email address. Accounts can be managed by an administrator. There is a $25 set-up fee and $9.99 monthly fee. The service includes:

Unlimited mail storage capacity.

Limit of 10 email accounts.

A user can pay an additional $35 per year to have up to five custom email addresses and a domain name.

Classic Yahoo! Mail underlines addresses and phone numbers in emails and allows the user to add them to the address book.

Another way to access POP3 without subscribing for paid mail plans is through Yahoo! Delivers. According to the Yahoo! Mail help pages,[17] "Yahoo! offers POP access to Yahoo! Mail as a free feature exclusively for Yahoo! Delivers members". However, this applies only to users of Canadian Yahoo Mail with the "@yahoo.ca" extension of their email address.[17][18] In countries where there is web browser access restriction, users can use YPOPs! and FreePOPs, which simulate a POP3 server.

Yahoo! made a deal with the online communications company Four11 for co-branded white pages. Marvin Gavin, who worked at Four11 as the Director of International Business Development, said "We always had a bias about being acquired by Yahoo. They were more entrepreneurial than Microsoft. We had a great cultural fit – it made a lot of sense." In the end, Yahoo! acquired Four11 for $96 million. The purpose behind acquiring Four11 was the company's RocketMail webmail service, which launched in 1997. Yahoo! announced the acquisition on October 8, 1997,[20] close to the time that Yahoo! Mail was launched.[21] Yahoo! chose acquisition rather than internal platform development, because, as Healy said, "Hotmail was growing at thousands and thousands users per week. We did an analysis. For us to build, it would have taken four to six months, and by then, so many users would have taken an email account. The speed of the market was critical."[this quote needs a citation]

The transition to Yahoo! Mail was not easy for many Rocketmail users.[22] On March 21, 2002, Yahoo! eliminated free software client access and introduced the $29.99 per year Mail Forwarding Service.[23] Mary Osako, a Yahoo! Spokeswoman, told CNET, "For-pay services on Yahoo!, originally launched in February 1999, have experienced great acceptance from our base of active registered users, and we expect this adoption to continue to grow."[this quote needs a citation]

During 2002, the Yahoo! network was gradually redesigned. On July 2, the company website was changed, and it was announced that Yahoo! Mail and other services would also be redesigned.[24] Along with this new design, new features were to be implemented, including drop-down menus in DHTML, different category tabs, and a new user-customizable color scheme. Yahoo! Network Services senior vice president Geoff Ralston stated that

The launch of Yahoo! Mail Plus is part of Yahoo's strategic initiative to offer premium services that deliver innovative, reliable and relevant services to consumers ... In just five years, Yahoo! Mail has grown from one million to tens of millions of users, illustrating how consumers have made email an essential part of their daily lives. Through Yahoo! Mail Plus, Yahoo! continues to demonstrate leadership and innovation by offering consumers the industry's most complete and powerful email solution.[16]

On April 1, 2004, Google announced its Gmail service with 1 GB of storage, however Gmail's invitation-only accounts kept the other webmail services at the forefront. Most major webmail providers, including Yahoo! Mail, increased their mailbox storage in response. Yahoo! first announced 100 MB of storage for basic accounts and 2 GB of storage for premium users.[25] However, soon Yahoo! Mail increased its free storage quota to 1 GB, before eventually allowing unlimited storage. Yahoo! Mail had free unlimited storage from March 27, 2007 until October 8, 2013.

On July 9, 2004, Yahoo! acquired Oddpost, a webmail service which simulated a desktop email client. Oddpost had features such as drag-and-drop support, right-click menus, RSS feeds, a preview pane, and increased speed using email caching to shorten response time. Many of the features were incorporated into an updated Yahoo! Mail service.[26]

On September 17, 2010, Yahoo! showed off a new Mail program to reporters.[27][28] Codenamed "Minty", the 2011 release was announced on September 16, 2010.[29] It included a new interface, enhanced performance, improved Facebook and Twitter integration, the ability to watch YouTube videos straight from email, and improved search.[30] Public beta began on October 26, 2010.[31] In May 2011, the new Yahoo! Mail became the default interface.[11] As the new interface became mandatory for users, some users of Yahoo! Mail reported slow typing speeds, contradicting Yahoo's claims of faster performance. Yahoo! offered no resolution to the problem as of September 12, 2011[update]. Users also missed the ability to paste textual email addresses into the sender box. The new version disabled the use of the "secondary" addresses provided in the previous version. The new interface overrode the browser's right mouse button (making functions such as opening mails in new tab windows unavailable).[citation needed]

In 2013, Yahoo redesigned the site and removed several features, such as simultaneously opening multiple emails in tabs, sorting by sender name, and dragging mails to folders.[32][33] The new email interface was geared to give an improved user-experience for mobile devices, but was criticized for having an inferior desktop interface.[citation needed] Many users objected to the unannounced nature of the changes through an online post asking Yahoo to bring back mail tabs with one hundred thousand voting and nearly ten thousand commenting.[34] The redesign produced a problem that caused an unknown number of users to lose access to their accounts for several weeks.[35]

In December 2013, Yahoo Mail suffered a major outage where approximately one million users, one percent of the site's total users, could not access their emails for several days. Mayer publicly apologized to the site's users.[36][37][38][39]

In January 2014, an undisclosed number of usernames and passwords were released to hackers, following a security breach that Yahoo believed had occurred through a third-party website. Yahoo contacted affected users and requested that passwords be changed.[40]

Yahoo updated the mail service with a "more subtle" redesign in 2015, as well as improving mobile features, and introducing the Yahoo Account Key, a smartphone-based replacement for password logins.[41]

Yahoo! Mail is often used by spammers to provide a "remove me" email address. Often, these addresses are used to verify the recipient's address, thus opening the door for more spam.

Yahoo! does not tolerate this practice and terminates accounts connected with spam-related activities without warning, causing spammers to lose access to any other Yahoo! services connected with their ID under the Terms of Service. Additionally, Yahoo! stresses that its servers are based in California and any spam-related activity which uses its servers could potentially violate that state's anti-spam laws.[43][44]

In February 2006, Yahoo! announced its decision (along with AOL) to give some organizations the option to "certify" mail by paying up to one cent for each outgoing message, allowing the mail in question to bypass inbound spam filters.[45]

In April 2011, Yahoo! Mail began rejecting spam reports, which involved sending a copy of the spam with full headers by email to Yahoo's abuse department, offering the use of a form instead. However, the requirement to use a form is prohibited by several Internet RFCs, and the availability of abuse at example.com (in this case abuse at yahoo.com) is required by the Invariants clause of RFC 2142, because the domain has a mail server and an MX record. Yahoo's claim was that its "standard" was better than the Internet standards referred to. This is the only working form through which users can report spam or misuse of the Yahoo! email service.[citation needed]

In order to prevent abuse, in 2002 Yahoo! Mail activated filters which changed certain words (that could trigger unwanted Javascript events) and word fragments into other words. "mocha" was changed to "espresso", "expression" became "statement", and "eval" (short for "evaluation") became "review". This resulted in many unintended corrections, such as "prreviewent" (prevalent), "reviewuation" (evaluation) and "medireview" (medieval).

When asked about these changes, Yahoo! explained that the changed words were common terms used in web scripting, and were blacklisted to prevent hackers from sending damaging commands via the program's HTML function. Starting before February 7, 2006, Yahoo! Mail ended the practice, and began to add an underscore as a prefix to certain suspicious words and word fragments.[citation needed]

Incoming mail to Yahoo! addresses can be subjected to deferred delivery as part of Yahoo's incoming spam controls. This can delay delivery of mail sent to Yahoo! addresses without the sender or recipients being aware of it. The deferral is typically of short duration, but may extend up to several hours. Yahoo! does not specifically document this policy in detail, although some information is available.[46][47]

In 2004, Yahoo's Hong Kong office provided technical information to the Chinese authorities about the account of journalist Shi Tao, who was subsequently sentenced to ten years' imprisonment for "leaking state secrets".[48] Yahoo! was criticized by Reporters Without Borders for acting as a "police informant" to increase its profits.[49] In August 2007, the United States Congress began an investigation into Yahoo's handling of the case.[50] Yahoo! founder Jerry Yang testified before Congress.[51] On November 6, 2007, the congressional panel criticized Yahoo! for not giving full details to the House Foreign Affairs Committee the previous year, stating it had been "at best inexcusably negligent" and at worst "deceptive".[52] Representative Tom Lantos described its executives as moral "pygmies".[53] Yang stated that Yahoo! no longer controlled its Chinese operations, and was collaborating with human rights groups to formulate ethical code for technology companies.[54]

In a February 2006 hearing, Yahoo! executives swore that they had received no information about the investigation. Several months later, it was discovered that the document provided to Yahoo! China on April 22, 2004 by the Beijing State Security Bureau stated that "Your office is in possession of the following items relating to a case of suspected illegal provision of state secrets to foreign entities."[55]

On November 13, 2007, Yahoo! settled with Shi for an undisclosed sum. Shi was released from prison in September 2013.

On February 20, 2006, it was revealed that Yahoo! Mail was banning the word "Allah" in email usernames, both separately and as part of a user name such as linda.callahan.[56] Shortly after the news of the ban, it was lifted on February 23, 2006. Along with this action, Yahoo! also made the following statement:[57]

We continuously evaluate abuse patterns in registration usernames to help prevent spam, fraud and other inappropriate behavior. A small number of people registered for IDs using specific terms with the sole purpose of promoting hate, and then used those IDs to post content that was harmful or threatening to others, thus violating Yahoo!'s Terms of Service.

'Allah' was one word being used for these purposes, with instances tied to defamatory language. We took steps to help protect our users by prohibiting use of the term in Yahoo! usernames. We recently re-evaluated the term 'Allah' and users can now register for IDs with this word because it is no longer a significant target for abuse. We regularly evaluate this type of activity and will continue to make adjustments to our registration process to help foster a positive customer experience.

In November 2012, an exploit for Yahoo! Mail was sold for $700 by an Egyptian hacker, allowing hijackers to hack Yahoo! Mail user accounts and redirect users to a malicious website. The attack used cross-site scripting which let hackers steal cookies.[58][59][60] In January 2013, hacker and security researcher Shahin Ramezany pointed out another DOM-based XSS loophole that placed 400 million users at risk.[61]

From 2007, Yahoo! was the email service used by New Zealand Telecom, which came under criticism in early 2013 following a spam and phishing attack that was described as the biggest to have ever hit the country.[62] Telecom and Yahoo! automatically reset "about 60,000" users' passwords.[63] In April, Telecom announced that despite the issue, it would retain Yahoo! as an email provider.[64]

Yahoo! Mail China officially announced its shutdown on April 18, 2013.[65][66] Users were warned that all emails, contacts, and account settings would be inaccessible, unless users migrated to the American version of Yahoo! Mail. Individuals who made China Yahoo! Mail accounts during the Alibaba takeover were required to create new accounts under new usernames.[67]

On October 3, 2017, Oath, a subsidiary of Verizon and owner of Yahoo, announced that all Yahoo user accounts, approximately 3 billion, were affected by the previously announced August 2013 theft of accounts.[68] This information updates the December 14, 2016, announcement that more than 1 billion user accounts were hacked in a breach that had occurred back in 2013.[69] Earlier that year in September, Yahoo! announced that an additional 500 million user accounts had been breached in 2014.[70] The company was said to have discovered about the breach that affected hundreds of millions of accounts years before their initial announcement.[71]

NNFMP is an internal protocol not recognized by IANA or RFCs. Yahoo! uses this protocol to internally route email traffic across their network. The acronym stands for "Newman No-Frills Mail Protocol".[72] It is a simple, high-performance protocol comparable to QMTP. However, Yahoo! does not officially recognize its use.[73][74]

The mobile app for Yahoo! Mail can be downloaded from the App Store for iOS, and the Google Play Store for Android. Both versions of the app perform the same function, but are tailored to the mobile device's operating system. Some characteristics include replying to a message by opening a notification and separately archiving, deleting and starring notifications. It is available in several languages including English, Hindi, Bengali, Marathi, Tamil, Telugu, Gujarati and Kannada.[75]

^"Telecom defends email reset operation". 3 News NZ. February 18, 2013. Telecom is defending a move to cancel the passwords of about 60,000 Yahoo! Xtra customers which left some customers without access to their email accounts.